local pretty = require("cc.pretty")

local args = { ... }

local instance, user, repo = args[1]:match("https?://([^/]+)/([^/]+)/([^/]+)")

local function getContents(path)
    local url = "https://" .. instance .. "/api/v1/repos/" .. user .. "/" .. repo .. "/contents" .. (path and ("/" .. path) or "")
    local res, err = http.get(url)
    if not res then
        printError(err)
        return nil, err
    end
    return textutils.unserializeJSON(res:readAll())
end

local function walkRepository(basedir, callback)
    local res, err = getContents(basedir)
    if not res then
        return nil, err
    end
    for _, elem in ipairs(res) do
        if elem.type == "file" then
            callback(elem.path, elem)
        elseif elem.type == "dir" then
            walkRepository(elem.path, callback)
        else
            printError("unknown type: " .. elem.type)
        end
    end
end

local function downloadFile(url, path)
    local fp, err = io.open(path, "wb")
    if not fp then
        return nil, err
    end

    local rq
    rq, err = http.get(url, nil, true)
    if not rq then
        return nil, err
    end

    local headers = rq.getResponseHeaders()
    local length = tonumber(headers["Content-Length"]) or 1

    local written = 0
    local i = 0
    local _, y = term.getCursorPos()
    while true do
        local chunk = rq.read(100)
        if not chunk then break end
        fp:write(chunk)
        written = written + #chunk

        term.setCursorPos(1, y)
        term.clearLine()

        local w = math.min(25, math.floor(written * 25 / length))
        term.write("["..string.rep("=", w)..string.rep(" ", 25-w).."] ")
        term.write(string.format("%7.3f%% %s", 100 * written / length, path))
        i = i + 1
        if (i % 20) == 0 then
            sleep(0.1)
        end
    end
    fp:close()
    print()
end


walkRepository(nil, function(path, file)
    downloadFile(file.download_url, repo.."-clone/"..path)
end)